Nexo Alpha System User Manual

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USER MANUAL

USER MANUAL

VERSION :1.01

DATE : 06/10/10

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CONTENT

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INTRODUCTION 4

PLEASE READ CAREFULLY BEFORE PROCEEDING 5

1. ALPHA SERIES DESCRIPTION 8

1.1. LOUDSPEAKERS 8

1.2. NEXO TDCONTROLLERS 8

1.3. THE X-BOW FLYING SYSTEM 8

2. GENERAL SETUP INSTRUCTIONS 9

2.1. SPEAKER WIRING 9

2.1.1. Connectors 9

2.1.2. Cables 10

2.2. FLYING THE SYSTEM 11

2.2.1. Flown Systems Safety 11

2.2.2. Ground Stacks Safety 12

2.3. TDCONTROLLERS SETTINGS 13

2.3.1. SubTDcontroller + S2 parameter board 13

2.3.2. AlphaTDcontroller 13

2.3.3. AlphaETDcontroller (for use with Alpha E Series) 14

2.3.4. NX241 Digital TDcontroller 14

2.4. INITIAL SET-UP PRECAUTIONS 15

3. ALPHA ARRAYS - SOME BASIC RULES 15

3.1. ALPHA S2 PLACEMENT 15

3.2. SPL VERSUS FREQUENCY 15

3.3. SPL VERSUS DISTANCE 16

3.3.1. Single Cabinet 16

3.3.2. Straight Vertical Array (long throw) 17

3.3.3. Plane Rectangular Array 17

3.3.4. Hygrometry and Temperature - Air Absorption 18

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3.4. DIRECTIVITY - COVERAGE 19

3.4.1. Directivity of Multiple Sources - What Happens ? 19

3.4.2. Small Arrays (less than 4 Alphas M3 / M8) 20

3.4.3. Large Arrays (4 Alphas M3 / M8 and above) 20

4. AMPLIFIERS 21

4.1. RECOMMENDED POWER 21

4.2. CURRENT CAPABILITY 21

4.3. VOLTAGE GAIN 21
II. TECHNICAL SPECIFICATIONS 22

4.4. ALPHA S2 22

4.5. ALPHA B1-15 / B1-18 23

4.6. ALPHA M3 / M8 24

4.7. ALPHA EM / EF 25

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4.8. DIRECTIVITY TABLES 26

5. CURVES 27

5.1. ALPHA S2 27

5.2. ALPHA B1-18 27

5.3. ALPHA B1-15 27

5.4. ALPHA M3 28

5.5. ALPHA M8 31

5.6. ALPHA EM 34

5.7. ALPHA EF 34
III. DIMENSIONS 37
IV. TRANSPORT 38
V. CONNECTION DIAGRAMS 39

I.

USER MANUAL

VERSION :1.01

DATE : 06/10/10

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Introduction

Thank you for selecting NEXO Alpha Series. This manual is intended to provide you with
necessary and useful information about your Alpha System:

• S2

• B1-15, B1-18

• M3, M8

• EM, EF

Please devote some attention to reading this manual. A better understanding of some specific
features of the Alpha Series will help you to operate your system to its full potential.

This manual is intended to be comprehensive, and we hope that it will satisfy your requirements.
Should you require further information, please contact your NEXO agent.

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USER MANUAL

VERSION :1.01

DATE : 06/10/10

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PLEASE READ CAREFULLY BEFORE PROCEEDING

BASIC PRECAUTIONS

Do not open the speaker system or attempt to disassemble the internal parts or modify them in
any way. The speaker system contains no user-serviceable parts. If it should appear to be
malfunctioning or damaged, discontinue use immediately and have it inspected by qualified
NEXO service personnel.

Water exposure: Do not expose the speaker system to direct rain, do not use it near water or in
wet conditions. Do not place containers with liquid on speaker system as they might spill into
openings. If any liquid such as water seeps into the speaker system, have it inspected by
qualified NEXO personnel.

SYSTEM DEPLOYMENT SAFETY RULES

Read User Manual before deployment. Before use of enclosed speaker system,
please ensure that anyone involved in system deployment understands the rigging –
stacking – pole mounting safety rules as described in the speaker system User
Manual. Failure to do this exposes people to potential injury or death.

Always consult qualified NEXO personnel if the device installation requires
construction work and make sure to observe the following precautions:

Mounting precautions

- choose mounting hardware and an installation location that can support the weight of the
speaker system;

- do not use speaker system handles for suspended installation;

- do not expose speaker system to excessive dust or vibration, or extreme cold or heat to
prevent possibility of component damage;

- do not place the speaker system in an unstable position from which it might fall accidentally;

- if speaker systems uses a stand, ensure that stand specifications are adapted, and that stand
height does not exceed 1.40m/55”; never move the stand while the speaker is in position.

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Connection and powering precautions

- remove all connected cables before moving the speaker system;

- turn off AC power of all power amplifier units before connecting the speaker system;

- when turning on the AC power to the audio system, always turn on the power amplifier last;
when turning the AC power off, always turn off the power amplifier first;

- when us ed in cold conditions, a gradual power ramp up should applied to the system on an 5
mn period to allow the loudspeaker components to stabilize during the very first minutes of
usage.

Inspect the speaker system periodically.

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SAFETY INSTRUCTIONS FOR NEXO TD CONTROLLERS

NEXO ANALOGUE PSTDCONTROLLERS, NX242 DIGITAL
CONTROLLER, NXAMP4x1 AND NXAMP4x4 POWERED
CONTROLLERS ARE CLASS 1 APPARATUS AND MUST BE EARTHED.

THE GREEN AND YELLOW WIRE OF THE MAINS CORD MUST ALWAYS BE CONNECTED
TO AN INSTALLATION SAFETY EARTH OR GROUND. THE EARTH IS ESSENTIAL FOR
PERSONAL SAFETY AS WELL AS THE CORRECT OPERATION OF THE SYSTEM, AND IS
INTERNALLY CONNECTED TO ALL EXPOSED METAL SURFACES.

- Read these instructions.

- Keep these instructions.

- Heed all warnings.

- Follow all instructions.

- Do not use this apparatus near water.

- Clean only with dry cloth.

- Do not block any ventilation openings. Install in accordance with the manufacturer’s
instructions.

- Do not install near any heat sources such as radiators, heat registers, stoves, or other
apparatus (including amplifiers) that produce heat.

- Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has
two blades with one wider than the other. A grounding type plug has two blades and a third
grounding prong. The wide blade or the third prong are provided for your safety. If the provided
plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
(US market)

- Protect the power cord from being walked on or pinched particularly at plugs, convenience
receptacles, and the point where they exit from the apparatus.

- Only use attachments/accessories specified by the manufacturer.

- Unplug this apparatus during lightning storms or when unused for long periods of time.

- Refer all servicing to qualified service personnel. Servicing is required when the apparatus has
been damaged in any way, such as power-supply cord or plug is damaged, liquid has been
spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or
moisture, does not operate normally, or has been dropped.

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The lightning flash with arrowhead

symbol, within an equilateral triangle

is intended to alert the user to the

presence of uninsulated “dangerous

voltage” within the product's

enclosure that may be of sufficient

magnitude to constitute a risk of

electric shock to persons.

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

WARNING: To reduce the risk of fire or electric shock,
do not expose this apparatus to rain or moisture.

To avoid electrical shock, do not remove covers.

Dangerous voltages exist inside.

Refer all servicing to qualified personnel only.

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The exclamation point within an

equilateral triangle is intended to

alert the user to the presence of

important operating and

maintenance (servicing) instructions

in the literature accompanying

the appliance.

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HIGH SOUND PRESSURE LEVELS

Exposure to extremely high noise levels may cause permanent hearing
loss. Individuals vary considerably in susceptibility to noise-induced hearing

loss but nearly everyone will lose some hearing if exposed to sufficiently
intense noise for a sufficient period of time. The U.S. Government’s
Occupational and Health Administration (OSHA) has specified the following
permissible noise level exposures: Sound Duration Per

Day In Hours Sound Level dBA, Slow Response

8 90
6 92
4 65
3 97
2 100

1 ½ 102

1 105

½ 110

¼ or less 115

According to OSHA, any exposure in excess of the above permissible limits could result in some
hearing loss. Ear plugs or protectors to the ear canals or over the ears must be worn when
operating this amplification system in order to prevent permanent hearing loss, if exposure is i n
excess of the limits as set forth above. To ensure against potentially dangerous exposure to high
sound pressure levels, it is recommended that all persons exposed to equipment capable of
producing high sound pressure levels such as this amplification system be protected by hearing
protectors while this unit is i n operation.

DISPOSAL OF OLD ELECTRICAL & EL E CT R ONIC EQUIPMENT

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This symbol on the product or on its packaging indicates that it shall not
be treated as household waste. Instead it shall be handed over to the
applicable collection point for the recycling of electrical and electronic
equipment. By ensuring this product is disposed of correctly, you will help
prevent potential negative consequence for the environment and human
health, which could otherwise be caused by inappropriate waste handling
of this product. The recycling of materials will help to conserve natural
resources. For more detailed information about recycling of this product,
please contact your local city office, your household waste disposal
service or the shop where you purchased the product.

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1. Alpha Series description

1.1. LOUDSPEAKERS

The Alpha range includes the following speakers :

• The S2 Sub-bass is a double 18-inch resonator loaded sub-bass, dedicated to very low frequency
reproduction ( < 80 Hz ) ;

• The B1-15 & B1-18 are complex l oaded (bass-reflex & exponential horn) bass cabinets ; the B1-15
houses one 15-inch driver, while the B1-18 houses one 18-inch driver ; frequency response ranges from
40 Hz up to 200 Hz ;

• The Mid-high M3 & M8 are concentric horn cabinets dedicated to the 200 Hz - 20 kHz frequency range
reproduction ; the MF range is handled by two exponential horn loaded 10-inch drivers whose response
is optimised by two Nexo designed phase plugs ; the HF range is handled by one constant directivity
horn loaded two-inch Neodynium driver.; M3 coverage is 35° (H) x 35°(V), M8 75° (H) x45° (V) ;

• The Mid-high EM forms part of the recently introduced Alpha E Series; its size and power-rating is
smaller than that of the Alpha M3 & M8 ; the mid range is handled by an exponential horn loaded 10’’
driver, while the HF range is handled by a constant directivity horn loaded ceramic 2’’ driver. Alpha EM
coverage is 75°x30°.

• The compact EF is dedicated to the full audio range reproduction 40 Hz – 20 kHz ; it resembles one EM
and one B1-1 8 stacked in a monoblock compact format.

Alpha cabinet fo rm ats are designed for op t i m al a rr a y as sembly (see sect i on VII “Dimensions”) ; al l the
cabinets have the same width and depth, height is in multiples of 200 mm.

• Double height (1200 mm ) : Alpha S2, Alpha EF ;

• 4/3 height (800 mm ) : Alpha B1-18 ;

• Single height (600 mm) : Alpha B1-15, Alpha M3, Alpha M8 ;

• 2/3 height (400 mm) : Alpha EM

1.2. NEXO TDCONTROLLERS

The Alpha Series speakers are associated with the following Nexo TDcontrollers :

• SubTDcontroller : Alpha S2 ;

• AlphaTDcontroller : Alpha B1-15, B1-18, M3 & M8 ;

• AlphaETDcontroller : Alpha B1-18, EM & EF ;

• NX241 Digital TDcontroller : all current Nexo speakers.

1.3. THE X-BOW FLYING SYSTEM

The design of the X-BOW flying system has been optimised for the dispersion specifications of
the Alpha range, its mechanical characteristics match accurately the acoustical properties of the
speakers.

The concept of this flying system enables efficient array assembly, with minimum space between
cabinet, thus reducing edge diffraction.

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The X-BOW flying system includes four main components, references are:

• ALXBOW : main chassis (1) ;

• ALXKIT : hinge (1) and cable links (2) ;

• ALXBRIDLE : D-ring (1) and leg chains (3);

• ALXCASE : flight-case for a complete X-BOW flying kit (capacity :4 X-Bows).

2. General Setup Instructions

2.1. SPEAKER WIRING

2.1.1. CONNECTORS

The loudspeakers are connected via SPEAKON connectors, NL4FC and NL 8FC (not s up plied). A
wiring diagram is printed on the connection panel located on the back of each cabinet.

The pins of the SPEAKON plugs are identified in/out and paralleled within the enclosures. Each
of these connectors can thus be used independently and simultaneously receive the power
amplifier signal feeding the main and the sub-bass systems : a single 8 conductors cable can
connect the amplifier rack and the speaker.

NB : Alpha S2 back panel features only one 4-pins SPEAKON connector, in order to prevent
paralleling : very few amplifiers could drive such low impedance loads.

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S2

EM
EF

M3
M8

CONNECTOR S2 B1-15 / B1-18 M3 / M8 EM / EF

1

In / Out VLF To VLF (S2) To VLF (S2) To VLF (S2)

SP4

#1

SP4

#2

±
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Not connected In / Out LF (B1) To LF (B1) To LF (B1)

±
1

- To VLF (S2) - -

±
2

- In / Out LF (B1) -

±

B1/15
B1/18

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- - In VLF (S2) In / Out VLF (S2)

±
2

- - In / Out LF (B1) In / Out LF (B1)

SP8

#1

SP8

#2

P = MF-HF passive / A = MF-HF active

2.1.2. CABLES

Nexo recommends the exclusive use of multi-conduct or cables to connect the system : the cable
kit is compatible with all the cabinets, and there is no possible confusion between VLF, LF, MF
and HF sections .

Cable choice consists mainly of selecting the correct cable section (size) in relation to the load
resistance and the cable length. Too small a cable section will increase its serial resistance, this
would induce power-loss and response variations (damping factor).

For a serial resistance less or equal to 4% of the load impedance (damping factor = 25), the maximum
cable length is gi v e n by :

= Z x S S in mm2, Z in Ohm, L

L

max

The table below indicates these values, for 3 common sizes.

Load Impedance (Ω)

Cable section Maximum Length (meters)

1,5 mm² (AWG #14) 3 4.5 6 9 12 18 24
2,5 mm² (AWG #12) 5 7.5 10 15 20 30 40

4 mm² (AWG #10) 8 12 16 24 32 48 64

Important :

±

3

- - In / Out MF

±

4

- - In / Out HF

±
1

- - In VLF (S2) In VLF (S2)

±
2

- - In / Out LF (B1) In / Out LF (B1)

±

3

- - In / Out MF

±

4

- - In / Out HF

±

in meters

max

2 3 4 6 8 12 16

P : In / Out MF+HF
A : In / Out MF
P : Not connected
A : In / Out HF

P : In / Out MF+HF
A : In / Out MF
P : Not connected
A : In / Out HF

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• long speaker cables induce capacitive effect that damage the quality of the audio signal (up to hundreds
of pF depending on the quality of the cable, with a low-pass effect in high frequencies) ;

• if long speaker cables are to be used, insure that they do not remain coiled while in use. .

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2.2. FLYING THE SYSTEM

Alpha Series loudspeakers are equipped with steel anchor plates that can be fitted with the corresponding
Fly Rails. The X-Bow flying system is supplied as an accessory. The X-Bow Flying Manual must be read

before flying the system.

The following points are designed to remind the user of safe practice when flying the X-Bow system. They
cannot address every possible circumstance in which the system might be deployed, therefore the user
must always apply his or her knowledge and experience. If in doubt, seek advice from your NEXO agent.

2.2.1. FLOWN SYSTEMS SAFETY

• Always inspect all the X-Bow components and cabinet Fly Rails for damage before assembly. Pay

special attention to the lifting points, trombone sockets and safety clips. If you suspect that any of the
components are defective, DO NOT USE THE AFFECTED PARTS. Contact your supplier for
replacements.

• Read the X-Bow Flying manual carefully. Also, be familiar with the manuals and safe working

procedures f or an y an c i ll ary equipment which will be used with t he X-Bow.

• Ensure that all local and National regulations regarding the safety and operation of flying equipment are

understood and adhered to. Information on these regulations can usually be obtained from Local
Government Offices.

• When deploying the X-Bow system always wear protective head wear, footwear and eye protection.

• Do not allow inexp erienced persons to handle X-Bow flying systems. Installation personnel should be

trained in loudspeaker flying techniques and should be fully conversant with this manual.

• Ensure that motor hoists, hoist control systems and ancillary rigging components are currently certified

as safe and that they pass a visual inspection prior to use.

• Ensure that public and personnel are not allowed to pass beneath the syst em during the installation

process. The work area should be isolated from public access.

• Never leave the system unattended during the installation process.

• Do not place any object, no matter how small or light, on top of the system during the installation

procedure. The object may fall when the system is flown and is likely to cause injury.

• Secondary safety steels must be installed once the system has been flown to the operating height.

Secondary steels must be fitted irrespective of the local safety standards applicable to the territory.

• Do not fly the system over areas to which the audience has access.

• Ensure that the system is secure and prevented from pivoting about the motor hoist. Avoid any form of

dynamic loading to the assembly.

• NEVER attach any item to the X-Bow other than the NEXO X-BOW accessories.

• When flying outdoor systems ensure that the system is not exposed to wind or snow loads and is

protected from rainfall.

• The X-BOW requires regular inspection and testing by a competent test centre. NEXO recommend that

the system is load tested and certified annually or more frequently if local regulations require.

• When de-rigging the system ensure that the same duty of care is given to the procedure as for the

installation. Pack X-BOW components carefully to prevent damage in transit.

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• Correct training is fundamental to safe practise when working with loudspeakers flying systems. NEXO
recommend that users contact local industry associations for information on specialist course.
Information for UK and International training agencies can be obtained by contacting :

The Production Services Association (PSA),
School Passage,
Kingston-upon-Thames,
KT1 SDU Surrey,
ENGLAND
tel : [phone]

2.2.2. GROUND STACKS SAFETY

Statistically, many more injuries occur due to unstable ground stacked PA systems than those associated
with flown systems. There are several reasons for this fact, however the message is clear :

• Always survey the supporting structure upon which a ground stack is to be built. Always look beneath

PA wings to inspect the deck support and if necessary ask for the stage scrims and dressings be
removed to allow access.

• X-BOW components can be used to stabilise ground stacks and to ensure that cabinets remain

securely registered to e ach other.

• If the stage surface slopes, as it does in some theatres, ensure that the system is prevented from

sliding forwards due to vi bration. This may require the fitting of timber battens to th e stage floor.

• For outdoor systems ensure that that the system is protected from wind forces which might cause the

ground stack to become unstable. Wind forces can be huge, especially upon large systems, and
should never be underestimated. Observe meteorological forecasts, calculate the likely effect upon the
system prio r to erection and ensure that the system is secured appropriately.

• Take care when stacking cabinets. Always employ safe lifting proc edures and never attempt to build

stacks withou t su ff i c i e nt pe r s on n e l an d e q ui pment.

• Never allow anyone, whether operators, artists or members of the public to climb onto a ground

stacked PA system. Anyone who must climb over 2m high should be fitted with suitable safely
equipment including a clip-on harness. Please refer to local Health and Safety legislation in your
territory. Your dealer can help with advice on access to this information.

• Apply the same attention to all safety matters when de-stacking systems.

• Be aware th at safety procedures are as important in the truck and in the warehouse as they are at the

venue.

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2.3. TDCONTROLLERS SETTINGS

The Alpha Series speakers do not work properly without their associated TDcontrollers.

Sound quality, reliability are totally dependent on the proper use of the TDcontrollers, in
agreement with Nexo instructions.

• SubTDcontroller : Alpha S2 ;

• AlphaTDcontroller : Alpha B1-15, B1-18, M3 & M8 ;

• AlphaETDcontroller : B1-18, EM & EF ;

• NX241 Digital TDcontroller : all current Nexo speakers.

These device manuals must be read before set-up.

2.3.1. SUBTDCONTROLLER + S2 PARAMETER BOARD

The SubTDcontroller output is a monophonic low-pass filtered sum of Left and Right inputs ;
Therefore, stereophonic use of Alpha S2 requires 2 SubTDcontrollers.

Connecting one single input of the device will reduce signal output by 6 dB. Three different
solutions can be applied to compensate for this 6 dB loss :

• Increase the output level on the front panel potentiometer by 6 dB ;

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• move the J4 jumper on the mother board to the “A” position (refer to SubTDcontroller manual) ;

• parallel the inputs with a “Y” split signal cable.

NB : the S2 parameter board disables the main system left an right XLR outputs, as well as the
Burst generator

Front panel phase switch and “Sub Delay” / “Sub Fine Delay” potentiometers are usefull to align
properly Alpha S2 phase relatively to Alpha B1. Below is what must be done depending on the
vertical alignement of the speakers :

S2 & B1 in the same vertical plane : phase Switch in “INV” position, « Sub Delay » potentiometer
at “0” position, , « Sub Fine Delay » rotated 3 steps to the right from the “0” position ;

S2 forward : phase Switch in “INV” position, « Sub Delay » and « Sub Fine Delay »
potentiometers adjusted to the average offset distance

S2 backward : : phase Switch in “INV” position, « Sub Delay » and « Sub Fine Delay »
potentiometers at “0” position.

2.3.2. ALPHATDCONTROLLER

The AlphaTDcontrollers features the following adjustments :

• LF, MF & HF ouput level ( +/- 6 dB ) ;

• « Array EQ » potentiometer (see section III.2) ;

• « X-Over / Wideband » switch.

If the main system is to be used without Alpha S2 sub-bass cabinet, the AlphaTDcontroller must
be used in the “Wideband” mode : the B1-15 response is then extended down to 42 Hz (B1-18

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down to 40Hz).
On the contrary, if the system includes Alpha S2 sub-bass cabinets, and the required SPL level in

the LF region is important, it is then recommended to switch to the “X-Over” mode.
It is also possible to overlap the S2 and B1 responses by switching the AlphaTDcontroller to

“Wideband” mode : the radiated energy will increase in the 40 Hz – 80 Hz range, but the Alpha
B1 power capability will decrease.

2.3.3. ALPHAETDCONTROLLER (FOR USE WITH ALPHA E SERIES)

The AlphaETDcontroller LF output is a low-pass filtered monophonic sum of the stereo inputs ;
MF/HF outputs are stereophonic.

The only available front panel adjustment is the LF output level, on a 12 dB range :

• LF mono , 1 AlphaETDcontroller, 2 inputs connected : the recommended position is “2” ;

• LF stereo, 2 AlphaETDcontrollers with 1 input connected : the recommended position is “1”.

The cross-over frequency between Alpha B1-18 and EM being located around 200 Hz, a
monophonic use of the LF range induces random phase relation between cabinets (image
distorsion, inaccurate low-mid frequency reproduction) ; therefore, except for some specific
situation (stadium PA systems, annoucements…), Nexo do not recommend monophonic use of
the LF range.

2.3.4. NX241 DIGITAL TDCONTROLLER

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The digital NEXO NX241 controller is able to drive the entire current Nexo range (PS & Alpha
series). Different software setups are loaded for the Alpha Series :

• Alpha B1-18 / EM / EF : NEXO NX241 is stereo in configuration (2 inputs, 4 outputs).

• Alpha S2 / B1-15 / M3 & M8, Full Range Mode : NEXO NX241 is in mono configuration (1

input, 4 outputs)

• Alpha S2 / B1-15 / M3 & M8, Aux Sub Mode : NEXO NX241 is in mono configuration, “Aux

Sub” input drives output “1”, “Full Range” input drives outputs 2, 3 and 4 ;

• Other setups are loaded, please refer to the NEXO NX241 user manual in order to avoid

inappropriate configurations that could damage your speakers.

Very important :
Due to the DSP processing time, there is no compability between analog SubTD / AlphaTD /

AlphaETD controllers and Digital NX241 unless the signal feeding the analog devices is delayed
by 1.4 ms.

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2.4. INITIAL SET-UP PRECAUTIONS

When starting up a system including brand new cabinets, NEXO recommends gradual power r amp up. The
loudspeaker components may need stabilising during his very first hours of usage. This is particularly true
for adhesives within the speaker’s moving assemblies.

In all cases, it is advisable to connect the loudspeakers only after all the other components have been
wired and are operating correctly. This is particularly important for the amplifiers and the TDcontroller. It is
a good practic e to turn down a ll the amplifie r gains before connecting the cabinets and then turn them up
again individually with a medium level music source fed into the system. The sense LEDs of the
corresponding TDcontroller channel should light up accordingly. This will help to locate cabling errors,
particularly channel line inversions which would disable the TDcontroller protections and may invalid ate the
warranty.

3. Alpha Arrays - Some Basic Rules

The concept of arraying speakers derives from two requirements :

• increased sound pressure level ;

• extended coverage area.

Array behaviour is very complex, and a bad design can lead to very poor results. The Alpha system was
designed to be flexible, allowing the user to optimise his design for a dedicated situation ; its development
included a long measurement program on a very large variety of arrays. Below are some simple rules that
the user must respect in his design.

3.1. ALPHA S2 PLACEMENT

The nominal efficiency data for Alpha S2 is given for when positioned on the floor (half-space). When flown,
the sensitivity is 3 dB lower ; on the contrary, if the Alpha S2 is positioned in an angle - respectively in a
corner -, the sensitivity will increase by 3 dB - respectively by 6 dB.

3.2. SPL VERSUS FREQUENCY

Array frequency response is strongly related to wavelength and array architecture.

• At low frequencies, wavelength being very large in relation to the size of the cabinets, speakers set

close to each other will always radiate in phase. The gain in sound pressure level L
per doubling, i.e. if n Alpha S2 or B1 are installed :

L

• In the mid frequency range, the gain depends on the configuration of the array, and will range from 3 to

6 dB per doubling, i.e. for n Alpha M3, M8, EM or EF :

10 log

(20Hz-100Hz) = 20 log10(n)

GSPL

(n) ≤ L

10

(100Hz-1kHz) ≤ 20 log10(n)

GSPL

will be of 6 dB

GSPL

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• At high frequencies, wavelength being short in relation to the size of the cabinet, the gain level is
smaller : no gain will be obtained for cabinets angled at their nominal coverage, maximum gain will be
obtained for n cabinets pointing in the same direction. Therefore, the gain will range from 0 to 3 dB per
doubling ; for n Alpha M3, M8, EM or EF :

0 ≤ L

• The Alpha TDcontroller Array EQ is derived from array measurements to compensate the array coupling
effect.

(1kHz-10kHz) ≤ 10 log10(n)

GSPL

AlphaTD Controller Array EQ / Frequency (Hz) / Gain (dB)

10.000

8.0000

6.0000

4.0000

2.0000

0.0

-2.000

-4.000

-6.000

-8.000

-10.00
20 100 1k 10k 20k

Alpha TDcontroller Array EQ

3.3. SPL VERSUS DISTANCE

In open-air conditions, the level of sound at a given distance is related to the following parameters :

• the size and the geometry of the source, which determines the shape of the sound wave (spherical,
cylindrical, plane) ;

• hygrometry and temperature : viscosity of the air and thermal conduction cause an energy loss
increasing with frequency. This phenomena is referred to as excess attenuation.

3.3.1. SINGLE CABINET

Lp(1m) being the sound pressure level at 1m, the level at a distance d (in meters) is given by :
Lp(d) = Lp(1m) - 20 log

(d)

10

Sound Pressure Level (dBSPL) / distance (meters)

110.00

100.00

90.000

80.000

70.000

60.000
1 10 100

Single Cabinet SPL versus Distance

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For example, if the level measured at 1 meter is Lp(1m) = 100 dBSPL, the level at 2 meters will be 94
dBSPL, 80 dBSPL at 10 meters and so on. Note that under these conditions of small source and open air,
the sound pressure level will be decreasing by 6 dB when doubling the distance.

3.3.2. STRAIGHT VERTICAL ARRAY (LONG THROW)

Some open-air applications might require loud level on a wide frequency range at a long distance. It is then
recommended to stack a large number of Alpha M3/M8/EM vertically. Up to a determined distance ­function of the frequency and the height of the stack -, the sound wave is cylindrical (3dB/2d) ; it becomes
progressively spherical (6dB/2d) above that distance.

Transition from cylindrical to spherical wavefront

Sound Pressure Level (dBSPL) / distance (meters)

110.00

100.00

90.000

80.000

70.000

60.000
1 10 100

3.3.3. PLANE RECTANGULAR ARRAY

When both dimensions of an array are greater than the listening distance, the energy is spread over a
plane surface : there is no attenuation wit h distance. As the listening dis tance increases, the sound wave
becomes cylindrical (-3dB/2d), and then spherical (-6dB/2d)

Sound Pressure Level (dBSPL) / distance (meters)

110.00

100.00

90.000

80.000

70.000

60.000
1 10 100

Transition from plane to cylindrical, to spherical wavefront

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3.3.4. HYGROMETRY AND TEMPERATURE - AIR ABSORPTION

Under usual conditions, air absorption :

− increases when relative humidity decreases ;

− increases when temperature decreases.

Air absorption gives a linear attenuation, i.e. a constant value of loss of dB per meter : if 1 dB is lost from
10 to 20 meters, 2 dB will be lost from 20 to 40 meters, 4 dB from 40 to 80 meters and so on...

The tables below list these values for normalised frequencies, and various values of relative humidity and
temperature :

At 20°C :

[dB] loss / meter Up to 1 kHz 2 kHz 4 kHz 8 kHz 16 kHz

RH 20% 0 0.02 0.06 0.20 0.66
RH 50% 0 0.01 0.03 0.08 0.27
RH 80% 0 0.00 0.02 0.05 0.17

Frequency (Hz) / Attenuation (dB)

10.000

0.0

-10.00

-20.00

-30.00

-40.00
20 100 1k 10k 20k

Air absorption over a 50 m distance ; RH=20%-50%-8 0%

At RH 50% :

[dB] loss / meter Up to 1 kHz 2 kHz 4 kHz 8 kHz 16 kHz

10°C 0 0.01 0.04 0.13 0.43
20°C 0 0.01 0.03 0.08 0.27
30°C 0 0.01 0.02 0.06 0.19

AUDIO PRECISION vs 17 JUL 97 19:30:05

10.000

0.0

-10.00

-20.00

-30.00

-40.00
20 100 1k 10k 20k

Air absorpt ion over a 50m di stance ; t=10°C-20°C-30°C

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The speed of sound C varies with temperature according to the formula below :

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The delay time between two sources spaced at a distance d is then :

∆t = C/d

3.4. DIRECTIVITY - COVERAGE

The two main qualities one might expect from a cabinet for array constructions are :

• a good directivity control in the mid an high frequency region, which guarantees the steadiness of the
interference region where dips and lobes occur ;

• a strong roll-off of the directivity function at the -6dB cut-off angle, which minimises the size of the
interference region.

The Alpha series cabinets were designed to respect these two criteria. Particularly, the Alpha M3
features a constant coverage angle +/- 5° from as low as 800 Hz up to 12 kHz, with high values of dB
loss / degrees at cut-off angle.

3.4.1. DIRECTIVITY OF MULTIPLE SOURCES - WHAT HAPPENS ?

In order to understand the coverage behaviour of combined sources, wavelength must be related to the
space between sources.

The wavelength λ (in meters) o f o sine wave is determined by :
λ = C/f where f is the frequency of the sine wave
This gives : λ(20Hz) = 17 m, λ(100Hz) = 3.4 m, λ(1kHz) = 34 cm and λ(20kHz) = 1.7 cm

where t° is the temperature in °C

273 t20 C +°=

• interference
The distance between sources generates a pathlength difference between the two signals that is nil on

axis and increases with the listening angle. If this pathlength difference increases to half the wavelength
in a specific direction, the two signals will cancel in that direction. This phenomenon is often described
as « interference ».

Pathlength

pathlength difference between two sound waves

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• resulting directivity
At low frequencies, because wavelength is much larger than the spacing between sources, interf erence

cannot result in cancellation ; however, directivity index will increase.
In the mid and high frequency range, where wavelength is comparable to spacing between sources, the

directivity polar plots will show dips and lobes. The amplitude of these lobes will depend on the
directivity of the individual sources and on their angulation.

However, lobes and dips will only appear on single tone signals (sine wave) ; on third octave or full
octave excitement, they will be smoothed.

3.4.2. SMALL ARRAYS (LESS THAN 4 ALPHAS M3 / M8)

The amplitude of the dips and the lobes is minimised when angling the cabinets at their nominal
coverage angle. If the angle is less than the coverage, the interference region will be larger, and if the
angle exceeds that value, there will be a « hole » between the cabinets.

It is therefore strongly recommended when using a small amount of cabinets to angle them at their
nominal coverage angle (Alpha M3 : 35°x35°, M8 : 75° x 45° ; EM/EF : 75° x 30°).

The only situations where such arrays can be assembled with very little angle are long throw
applications (very small vertical coverage).

3.4.3. LARGE ARRAYS (4 ALPHAS M3 / M8 AND ABOVE)

Construction of large arrays derives from important SPL requirements rather than large listening angles:
although the Alpha M3 is a high Q cabinet, 4 boxes are enough to cover a 140° horizontal plane...
Therefore, large arrays will usually assemble cabinets at less than their nominal coverage angle.

Measurements and simulations show that when using a large amount of cabinets, the individual
behaviour of a cabinet will determine the roll-off on the limits of the coverage zone, and the architecture
of the array will be responsible for the behaviour in the coverage zone.

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4. Amplifiers

4.1. RECOMMENDED POWER

For best results, NEXO specifies a range of amplifier powers relative to the capacity of the cabinets (see
« Technical Specifications »). The use o f amplifiers with lower power rating has no justification other than
budgetary. On the contrary, high power amplifiers (within reasonable limit) present no real technical
problem (bearing in mind that the servo-control system limits the delivered power when needed), but may
simply represent an unnecessary expense.

4.2. CURRENT CAPABILITY

When evaluating an amplifier, it is important to take account of its behaviour under load conditions (current
capacity) : a speaker system is highly reactive, with transient signals like music it can require a lot more
current than the nominal impedance would indicate. Apart from the manufacturer’ specifications, it is
possible to test the amplifier with two times the intended number of cabinets (two cabinets per channel in
place of one, four in place of two, etc...), and drive the system to the onset of clipping. If there is no
noticeable (audio) signal degradation, the amplifier is well suited (do not take much notice of amplifier
heating after several minutes but amplifier protection should not appear too quickly).

4.3. VOLTAGE GAIN

If Vin is the voltage applied to the input of the amplifier (small, so that the amplifier does not c lip, typically
100 mV@1kHz between pin 2 and pin 3 of the XLR connector), and V
of the amplifier (between black and red barrier strip, in Volts), then the voltage gain is :

L
It is very important that all the amplifiers within an installation have closely matched gains ; the variation

allowed must be less than +/- 0.5 dB. This precaution is very important for reliability in the case where only
one TD Controller is being used for several amplifiers. It is also recommended to use the same amplifiers
throughout and to check their gain periodically. If some different amplifiers must be mixed (e.g. in rental
situations), at least check their gain and adjust as necessary.

NEXO recommends the use of low gain amplifiers whenever possible, 26 dB being the preferred value as it
is quite comm on. The use of hig h-gain amplif iers has a negat ive effect i n terms of signal t o noise ratios :
the deliver ed noise is increase d whilst the maximum v oltage level remains the same (4.5 V peak at the
input is enough to drive a 26 dB gain, 500 W / 8 Ohm power amplifier to the onset of clipping).

Some amplifiers use non-linear compression circuits to smooth signal before clipping: for correct use of the
TD Controllers, NEXO recommends that these circuits are switched off in order to maintain the amplifier
linearity.

= 20 log10 (V

G

/ Vin)

out

the voltage measured at the output

out

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II. TECHNICAL SPECIFICATIONS

4.4. ALPHA S2

SYSTEM SPECS ALPHA S2 with SubTD Controller

Frequency Response [a] 32(?) Hz – 64 Hz ± 3 dB
Usable Range @-6dB [a] 29 Hz – 180 Hz
Sensitivity 1W @ 1m [b] 105 dB SPL
Peak SPL @ 1m [b] 140 dB Peak
Nominal Impedance 3 ohms (2.7 min)
Recommended Amplifiers 1800 to 2400 Watts into 3 ohms

FEATURES ALPHA S2

Components 2 x 18’’ (46cm) long excursion 6 ohms drivers, high efficiency acoustic load.
Height x Width x Depth
Shape 22.5 Trapezoid
Weight : Net
Connectors 1 x 4 poles Speakon 1+ & 1- (Sub S2)

Construction Baltic Birch with Dark Grey carpeting , Str uctured Black coating painting finish also available.
Handles 4 Metal Bar Handles
Front Finish Acoustic Foam on hex perforated steel grid (77% transparent)

Flying points

Fixed Installation The X-Bow Flying Tracks can also receive standard Aircraft Flying Fittings.

As part of a policy of continual improvement, NEXO reserves the right to change specifications without notice.
[a] Response Curves and Data : Anechoic Far Field above 200 Hz, Half-space Anechoic below 200 Hz.

Usable Range Data : Frequency Response Capability with TD crossover slopes removed.

[b] Sensitivity & Peak SPL : will depend on spectral distribution. Measured with band limited Pink Noise.
Refers to the specified +/- 3 dB range. Data are for Speaker + Processor + recommended amplifier combinations.

1200 x 689 x 754 mm carpet version
(47 ¼" x 27 1/8 " x 29 11/16")

85 kg (187 Lb)
with wheelboard: 95 kg (209 Lb)

4 Flying Tracks on front (7 positions on 2° steps)
Top to bottom Steel Backplate
2 Flying Tracks on Back (Hinge fixing)
Internal top to bottom Steel links
Painted version without Flying Tracks also available

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4.5. ALPHA B1-15 / B1-18

SYSTEM SPECS

Frequency Response [a] Wideband : 42 Hz – 180 Hz ± 3 dB
Usable Range @-6dB [a]

Sensitivity 1W @ 1m [b]
Peak SPL @ 1m [b]
Nominal Impedance
Recommended Amplifiers

FEATURES

Components 1 x 15" (38 cm) 6 ohms
Height x Width x Depth 600 x 689 x 754 mm
Shape

Weight : Net 51 kg (112 Lb)
Connectors
Construction

Handles
Front Finish
Flying points 4 Flying Tracks on front (7 positions on 2° steps)

Fixed Installation

As part of a policy of continual improvement, NEXO reserves the right to change specifications without notice.
[a] Response Curves and Data : Anechoic Far Field above 200 Hz, Half-space Anechoic below 200 Hz.

Usable Range Data : Frequency Response Capability with TD crossover slopes removed.

[b] Sensitivity & Peak SPL : will depend on spectral distribution. Measured with band limited Pink Noise.
Refers to the specified +/- 3 dB range. Data are for Speaker + Processor + recommended amplifier combinations.

Xover : 80 Hz – 190 Hz ± 3 dB
39 Hz – 600 Hz 38 Hz – 600 Hz

106 dB SPL 107 dB SPL Nominal
140 dB Peak 142 dB Peak
6 ohms (5.2 mini) 6 ohms (4.7 mini)
900 to 1200 Watts into 6 ohms 900 to 1400 Watts into 6 ohms

Folded Horn, Composite Curve
(23 5/8" x 27 1/8 " x 29 11/16")

with wheelboard : 58 kg (128 Lb)
2x 4 poles Speakon (In / Out)

Baltic Birch with Dark Grey carpeting, Structured Black coating painting finish also available.
2 Metal Bar Handles 4 Metal Bar Handles

4 Flying Tracks on Back (Hinge fixing)

Painted version without Flying Tracks also

ALPHA B1-15 ALPHA B1-18

40 Hz – 230 Hz ± 3 dB

ALPHA B1-15 ALPHA B1-18

1 x 18" (46 cm) 6 ohms
Folded Horn, Composite Curve
800 x 689 x 754 mm
(31.49" x 27 1/8 " x 29 11/16")

22.5° Trapezoid

69.9 kg (155 Lb)
with wheelboard : 79 kg (175 Lb)
1+ & 1- (Sub S2)
2+ & 2- (Bass B1)

Acoustic Foam on hex perforated steel grid (77% transparent)

Top to bottom Steel Backplate

Internal top to bottom Steel links

available

The X-Bow Flying Tracks can also receive standard Aircraft Flying Fittings.

Crossbow Flying System cabinet Hardware:

Optional 4 Flying Tracks on Front

Internal top to bottom Steel links

Optional 2 Flying tracks on back (Hinge fixing)

Painted version without Flying Tracks also

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4.6. ALPHA M3 / M8

SYSTEM SPECS

Frequency Response [a]
Usable Range @-6dB [a]
Sensitivity 1W @ 1m [b]
Peak SPL @ 1m [b]
Dispersion [c]
Directivity : Q & DI [c]
Nominal Impedance MF : 12 ohms (15.5 min)

Recommended Amplifiers MF : 650 to 900 Watts into 12 ohms

FEATURES ALPHA M3 ALPHA M8

Components

Height x Width x Depth
Shape 22.5° Trapezoid
Weight : Net

Connectors

Construction Baltic Birch with Dark Grey carpeting, Structured Black coating painting finish also available.
Handles 2 Metal Bar Handles
Front Finish Acoustic Foam on hex perforated steel grid (77% transparent)

Flying points

Fixed Installation The X-Bow Flying Tracks can also receive standard Aircraft Flying Fittings.

As part of a policy of continual improvement, NEXO reserves the right to change specifications without notice.
[a] Response Curves and Data : Anechoic Far Field above 200 Hz, Half-space Anechoic below 200 Hz.

Usable Range Data : Frequency Response Capability with TD crossover slopes removed.

[b] Sensitivity & Peak SPL : will depend on spectral distribution. Measured with band limited Pink Noise.
Refers to the specified +/- 3 dB range. Data are for Speaker + Processor + recommended amplifier combinations.

[c] Directivity Curves and Data : 1/3 octave smoothed frequency response, normalised to On-Axis response.

Data obtained by computer processing on off-axis response curves.

190 Hz – 19 kHz ± 3 dB 190 Hz – 19 kHz ± 3 dB
150 Hz – 20 kHz 150 Hz – 20 kHz
110 dB SPL 108 dB SPL
145 dB Peak 143 dB Peak
35° x 35° 75° x 45° (HF Horn Rotatable)
Q = 32 – DI = 15 dB (Nominal f > 630 Hz) Q = 20 – DI = 13 dB (Nominal f > 630 Hz)

HF : 12 ohms (8.0 min)
HF : 350 to 500 Watts into 12 ohms

2 x 8 poles Speakon (In / Out)

1 x 4 poles Speakon (to B1 & S2)

ALPHA M3 ALPHA M8

MF : 12 ohms (15.5 min)
HF : 12 ohms (8.0 min)
MF : 650 to 900 Watts into 12 ohms
HF : 350 to 500 Watts into 12 ohms

MF : 2 x 10" (24 cm) 8 ohms 3” Coil Drivers ; Dual Ring Phase Plugs

HF : 1 x 3’’ Neodynium Driver, Titanium diaphragm

Painted version without Flying Tracks also available

Coaxial mounted waveguide

600 x 689 x 754 mm Carpet version

(23 5/8" x 27 1/8 " x 29 11/16")

57 kg (126 Lb)

with wheelboard: 64 kg (141 Lb)

4 Flying Tracks on front (7 positions on 2° steps)

Top to bottom Steel Backplate

4 Flying Tracks on Back (Hinge fixing)

Internal top to bottom Steel links

1+ & 1- (Sub S2)
2+ & 2- (Bass B1)
3+ & 3- (MF)
4+ & 4- (HF)
1+ & 1- (Sub S2)
2+ & 2- (Bass B1)

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4.7. ALPHA EM / EF

SYSTEM SPECS

Frequency Response [a]
Usable Range @-6dB [a]
Sensitivity 1W @ 1m [b]
Peak SPL @ 1m [b]

Dispersion [c]
Directivity : Q & DI [c]
Cross-Over Frequency

Nominal Impedance
Recommended Amplifiers

FEATURES

Components

Height x Width x Depth 400 x 689 x 754 mm Carpet version
Shape

Weight : Net
Connectors

Construction
Handles

Front Finish
Flying points (optional) 4 Flying Tracks on front (7 positions on 2° steps)

Fixed Installation

As part of a policy of continual improvement, NEXO reserves the right to change specifications without notice.
[a] Response Curves and Data : Anechoic Far Field above 200 Hz, Half-space Anechoic below 200 Hz.

Usable Range Data : Frequency Response Capability with TD crossover slopes removed.

[b] Sensitivity & Peak SPL : will depend on spectral distribution. Measured with band limited Pink Noise.
Refers to the specified +/- 3 dB range. Data are for Speaker + Processor + recommended amplifier combinations.

[c] Directivity Curves and Data : 1/3 octave smoothed frequency response, normalised to On-Axis response.

Data obtained by computer processing on off-axis response curves.

220 Hz – 19 kHz ± 3 dB 40 Hz – 19 kHz ± 3 dB
180 Hz – 20 kHz ± 6 dB 38 Hz – 20 kHz ± 6 dB
107 dB SPL 107 dB SPL

140 dB Peak
75° x 30° 75° x 30°

Q = 25 – DI = 14 dB (Nominal f > 630 Hz) Q = 25 – DI = 14 dB (Nominal f > 630 Hz)
MF/HF : 2.2 kHz (Passive)

8 ohms (7.5 min)
700 to 1000 Watts into 8 ohms

MF : 1 x 10" (24 cm) 8 ohms
HF : 1 x 3’’ Ceramic Driver, Titanium diaphragm
Coaxial mounted waveguide

(15 3/4" x 27 1/8 " x 29 11/16")

2 x 8 poles Speakon (In / Out)

1 x 4 poles Speakon (to B1 & S2)

Baltic Birch with Dark Grey carpeting, Structured Black coating painting finish also available.
2 Metal Bar Handles 4 Metal Bar Handles

ALPHA EM ALPHA EF

LF : 142 dB Peak
MF/HF : 140 dB Peak

LF/MF : 210 Hz (Active)
MF/HF : 2.2 kHz (Passive )
LF : 6 ohms (4.7 min)
MF/HF : 8 ohms (7.5 min)
MF : 900 to 1400 Watts into 6 ohms
MF/HF : 700 to 1000 Watts into 8 ohms

ALPHA EM ALPHA EF

LF : 1 x 18’’ (46cm) 6 Ohms Composite Curve
MF : 1 x 10" (24 cm) 8 ohms
HF : 1 x 3’’ Ceramic Driver, Titanium diaphragm
Coaxial mounted waveguide
1200 x 689 x 754 mm Carpet version
(47 1/4" x 27 1/8 " x 29 11/16")

22.5° Trapezoid

46.6 kg (99 Lb)
1+ & 1- (Sub-bass S2)

2+ & 2- (Bass B1)
3+ & 3- (MF/HF)
4+ & 4- (NC)

1+ & 1- (Sub-bass S2))
2+ & 2- (Bass B1)

Acoustic Foam on hex perforated steel grid (77% transparent)

Top to bottom Steel Backplate

4 Flying Tracks on Back (Hinge fixing)

Internal top to bottom Steel links

Painted version without Flying Tracks also available

The X-Bow Flying Tracks can also receive standard Aircraft Flying Fittings.

98 kg (209 Lb)

with wheelboard : 105 kg (231 Lb)

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4.8. DIRECTIVITY TABLES

Off-Axis At tenuation from On-Axis Freque ncy Response (dB)

125 Hz

Angle / dB

B1+M3 hor 0.0 0.5 1.3 2.0 2.5 3.5 4.3 4.5 5.0 4.8 6.0 6.0 6.5 6.8 6.3 7.0 6.3
B1+M3 vert 0.0 0.3 0.5 1.5 2.0 2.8 3.5 4.3 4.8 5.5 6.0 6.8 6.8 6.0 7.0 6.5 6.0
B1+M8 hor 0.0 0.5 1.3 2.0 2.5 3.5 4.3 4.5 5.0 4.8 6.0 6.0 6.5 6.8 6.3 7.0 6.3 5.8 5.5
B1+M8 vert 0.0 0.3 0.5 1.5 2.0 2.8 3.5 4.3 4.8 5.5 6.0 6.8 6.8 6.0 7.0 6.5 6.0 5.5 5.5
EM/EF hor 0.0 0.3 0.5 1.0 2.0 2.5 3.3 4.0 4.5 5.0 5.5 6.3 6.0 6.0 5.8 5.3 4.5 4.3 4.0
EM/EF vert 0.0 0.0 0.3 0.5 1.0 1.5 2.0 2.8 3.5 4.0 4.8 5.5 6.0 6.0 5.8 5.0 4.5 4.3 4.0

250 Hz

Angle / dB

B1+M3 hor 0.0 0.3 1.0 2.0 3.0 4.3 5.5 6.8 8.0 8.5 9.5 9.8 9.8 10.0 9.5 8.8 8.0
B1+M3 vert 0.0 0.3 0.8 1.5 2.5 4.0 5.3 6.5 7.5 8.5 9.8 10.8 12.0 12.0 11.0 9.8 8.5
B1+M8 hor 0.0 0.3 0.8 2.0 3.0 4.3 6.0 7.0 8.0 8.8 9.3 10.0 10.5 10.3 10.0 9.3 8.0
B1+M8 vert 0.0 0.3 1.0 1.8 3.0 4.3 5.5 7.0 8.0 9.3 10.3 11.3 12.0 12.0 11.0 9.8 8.8

EM/EF hor 0.0 0.3 0.8 1.8 3.0 4.0 5.3 6.3 7.0 7.8 8.0 8.5 8.8 8.8 8.3 7.5 6.5 6.0 6.0

EM/EF vert 0.0 0.0 0.5 1.0 1.5 2.5 3.3 4.0 4.8 5.5 6.5 7.5 8.5 8.8 8.8 8.0 7.0 6.3 6.0

500 Hz

le / dB 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180

:B1+M3 hor 0.0 0.5 2.0 4.5 7.3 9.8 12.0 14.0 15.8 16.8 17.8 18.8 19.0 18.8 18.5 18.0 17.0 15.0 14.5

B1+M3 vert 0.0 0.5 2.0 4.3 6.8 9.3 11.8 13.5 15.0 16.3 17.3 18.3 19.0 20.0 20.5 21.0 19.3 16.0 14.5
B1+M8 hor 0.0 0.5 2.0 4.3 6.5 9.0 12.0 14.0 16.3 17.8 18.5 19.0 19.3 19.5 19.5 19.5 17.5 15.5 15.8
B1+M8 vert 0.0 0.5 2.0 4.0 6.5 8.8 11.3 13.5 15.5 16.8 17.5 18.3 19.3 20.5 21.5 21.8 19.5 16.5 15.8

EM/EF hor 0.0 0.5 2.0 4.0 6.5 9.3 11.8 14.0 15.8 17.0 17.0 17.3 17.8 18.0 17.8 16.3 14.3 12.5 12.0

EM/EF vert 0.0 0.3 1.0 1.8 3.0 4.5 6.0 7.5 8.8 10.0 11.0 11.3 12.0 13.0 15.0 16.3 14.5 12.8 12.0

1000 Hz

le / dB 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180

B1+M3 hor 0.0 1.3 5.0 10.0 13.0 14.5 15.8 17.3 18.8 20.0 21.5 22.3 23.5 24.5 23.5 20.5 21.0 18.5 16.8
B1+M3 vert 0.0 1.8 6.0 10.8 12.3 13.0 14.3 15.5 17.3 18.5 19.5 20.5 21.5 22.0 22.8 23.5 26.3 20.5 16.8
B1+M8 hor 0.0 1.5 5.5 9.8 11.5 12.5 13.8 15.3 17.0 18.8 19.5 21.0 22.0 22.3 22.0 20.0 20.8 17.5 16.3
B1+M8 vert 0.0 1.8 6.5 11.0 11.5 12.0 13.3 15.0 16.5 17.8 18.5 20.0 21.0 21.3 21.8 21.5 20.5 19.5 16.3
EM/EF hor 0.0 2.0 6.3 9.8 9.5 9.5 10.3 11.3 12.5 13.5 14.3 15.3 16.5 17.5 18.8 17.3 18.8 19.0 17.0
EM/EF vert 0.0 0.8 2.5 5.0 8.0 10.8 13.0 15.3 17.5 19.3 20.3 21.0 21.5 22.0 23.0 23.0 21.3 19.0 17.0

2000 Hz

le / dB 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180

B1+M3 hor 0.0 1.3 6.0 14.0 14.5 16.0 18.3 19.8 21.5 23.3 25.5 27.5 28.5 30.0 30.0 29.8 27.8 27.3 28.0
B1+M3 vert 0.0 1.8 7.0 14.3 15.8 17.0 20.0 21.8 23.3 24.5 25.8 27.0 28.3 29.0 29.0 29.3 29.5 29.3 28.0
B1+M8 hor 0.0 1.5 5.8 10.5 11.5 11.3 13.5 16.5 20.5 24.0 25.5 28.0 27.3 27.5 27.5 28.5 27.0 28.5 28.0
B1+M8 vert 0.0 2.3 7.5 12.5 15.0 16.0 18.0 20.5 22.5 24.5 25.8 27.0 28.0 29.0 27.8 26.8 29.0 29.5 28.0
EM/EF hor 0.0 1.5 4.5 7.8 7.8 8.0 10.0 12.5 15.5 18.0 19.5 20.0 21.5 22.8 23.0 23.8 25.5 25.8 24.0
EM/EF vert 0.0 1.8 5.5 10.5 14.5 16.5 18.3 20.0 22.0 24.0 25.5 26.3 27.0 28.0 29.3 28.0 26.5 25.0 24.0

4000 Hz

le / dB 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180

M3 hor 0.0 2.0 6.5 11.3 16.0 19.5 22.5 25.5 28.8 31.8 34.5 37.3 38.3 39.8 40.5 40.3 40.5 38.0 37.8
M3 vert 0.0 2.3 6.8 12.3 16.5 19.0 22.5 25.5 29.5 32.0 34.5 36.8 38.3 39.3 39.3 40.0 39.5 38.8 37.8
M8 hor 0.0 1.0 3.8 6.8 11.3 14.3 18.0 21.0 25.0 28.8 31.0 33.0 34.3 35.0 36.0 37.0 38.0 39.5 38.0

M8 vert 0.0 2.0 5.8 11.0 15.5 20.0 23.3 27.0 30.0 33.0 34.8 36.5 37.3 38.0 39.0 40.0 41.0 40.5 38.0
EM/EF hor 0.0 1.5 3.8 5.5 6.8 9.3 12.3 16.0 19.8 23.8 26.5 28.3 29.3 30.0 31.0 33.8 33.0 33.5 32.3
EM/EF vert 0.0 2.8 7.8 12.8 16.3 19.3 21.8 24.0 26.0 28.3 30.0 31.0 32.5 33.8 34.5 35.0 34.8 34.0 32.3

8000 Hz

le / dB 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180

M3 hor 0.0 1.5 7.0 13.3 18.5 22.3 25.0 29.5 34.8 39.0 42.8 45.3 45.5 47.8 48.8 47.0 48.0 46.3 47.3
M3 vert 0.0 1.8 7.0 13.5 18.8 21.5 25.0 28.5 33.8 38.0 40.5 42.5 44.5 45.5 46.3 47.3 48.0 49.0 47.3
M8 hor 0.0 0.3 2.0 6.3 11.8 15.0 19.0 22.5 28.0 31.8 40.5 43.0 44.0 45.0 46.0 47.0 48.0 49.0 47.5
M8 vert 0.0 1.8 5.8 11.3 16.5 20.8 24.3 29.0 32.0 35.0 42.0 44.0 45.0 46.0 47.0 48.0 49.0 47.0 47.5

EM/EF hor 0.0 0.8 3.0 6.0 8.0 11.5 14.5 18.5 24.3 30.0 33.8 36.3 37.0 39.3 40.5 41.8 41.8 42.5 42.0
EM/EF vert 0.0 3.3 9.5 15.5 20.0 23.3 24.5 26.5 30.8 34.3 36.0 38.0 38.8 39.8 40.0 41.5 41.5 40.8 42.0

NB data available in E AS E ™ for m at.

10 20 30 40

10 20 30 40

150 160 1701

5.5 5.5

150 160 1701

7.57.

8.0 7.5

7.57.

7.8 7.8

USER MANUAL

VERSION :1.01

DATE : 06/10/10

α

α

α

5. CURVES

5.1. ALPHA S2

P 27

On Axis Response Alpha S2 With SubTD Controller (dB)

10.000

0.0

-10.00

-20.00

-30.00
30 100 1k 10k 20k

Frequency Response with SubTD Controller (dB) Impedance (Ohms)

Impedance Alpha S2 (Ohm)

50

10

2

10 100 1k 10k

5.2. ALPHA B1-18

On Axis Response Alpha B1-18 With AlphaETD Controller (dB)

10.000

0.0

-10.00

-20.00

-30.00
30 100 1k 10k 20k

Frequency Response with AlphaETD Controller (dB) Impedance (Ohms)

Impedance Alpha B1-18 (Ohm)

50

10

2

10 100 1k 10k

5.3. ALPHA B1-15

On Axis Response Alpha B1-15 With AlphaTD Controller (Overlap/X-over)

10.000

Impedance Alpha B1-15 (Ohm)

50

0.0

-10.00

-20.00

-30.00
30 100 1k 10k 20k

Frequency Response with AlphaTD Controller (dB) Impedance (Ohms)
Black : Overlap Mode, Grey : X-Over mode

Frequency Response Curves : Anechoic Far Field above 200 Hz, Half-space Anechoic below 200 Hz.
Impedance :
Off-Axis Frequency Response
Directivity Curve, Coverage Angle and Polar Diagram

Voltage to Current Ratio, Free Field measurement

: 1/3 octave smoothed frequency response, normalised to On-Axis response.

from computer processing on off-axis response curves.

USER MANUAL

VERSION :1.01

DATE : 06/10/10

10

2

10 100 1k 10k

α

α

α

5.4. ALPHA M3

P 28

On Axis Response Alpha M3 With AlphaTD Controller (dB)

10.000

0.0

-10.00

-20.00

-30.00
20 100 1k 10k 20k

Frequency Response with AlphaTD Controller (dB) Impedance (Ohms)
Black : MF, Grey : HF

Directivity Index (dB) & Q Alpha M3

20.000

15.000

10.000

5.0000

0.0

100 1k 10k 20k

Directivity Index (dB) and Factor Nominal Coverage @ –6 dB (Degrees)

Horizontal Off-Axis Response Alpha M3 (dB)

10.000

0.0

-10.00

100

10

1

Impedance Alpha M3 (Ohm)

50

10

2

20 100 1k 10k 20k

Coverage Angle Alpha M3 (Degree)

200

100

20

100 1k 10k 20k

Vertical Off-Axis Response Alpha M3 (dB)

10.000

0.0

-10.00

-20.00

-30.00

100 1k 10k 20k

Horizontal Off-Axis Frequency Response @ 10, 20 & 30° Vertical Off-Axis Frequency Response @ 10, 20 & 30°

Frequency Response Curves : Anechoic Far Field above 200 Hz, Half-space Anechoic below 200 Hz.
Impedance :
Off-Axis Frequency Response
Directivity Curve, Coverage Angle and Polar Diagram

Voltage to Current Ratio, Free Field measurement

: 1/3 octave smoothed frequency response, normalised to On-Axis response.

from computer processing on off-axis response curves.

USER MANUAL

VERSION :1.01

DATE : 06/10/10

-20.00

-30.00
100 1k 10k 20k

α

α

α

P 29

0

700

600

500

400

Alpha M3 - Horizontal Directivity ( 5dB / div.)

0°

330°

300°

270°

240°

210°

330°

300°

270°

240°

210°

330°

300°

30°

60°

300°

90°

200 Hz 250 Hz 315 Hz 400 Hz

180°

0°

500 Hz 630 Hz 800 Hz 1 kHz

180°

0°

270°

120°

240°

150°

30°

60°

300°

90°

270°

120°

240°

150°

30°

60°

300°

0°

330°

210°

330°

210°

330°

30°

60°

300°

90°

270°

120°

240°

150°

180°

0°

30°

60°

300°

90°

270°

120°

240°

150°

180°

0°

30°

60°

300°

0°

330°

210°

330°

210°

330°

30°

60°

300°

90°

270°

120°

240°

150°

180°

0°

30°

60°

300°

90°

270°

120°

240°

150°

180°

0°

30°

60°

300°

0°

330°

210°

330°

210°

330°

30°

60°

90°

120°

150°

180°

0°

30°

60°

90°

120°

150°

180°

0°

30°

60°

270°

240°

300

300°

270°

240°

200

300°

270°

100

240°

0

50 100 150 200 250 300 350 400 450 500 55

1.25 kHz 1.6 kHz 2 kHz 2.5 kHz

210°

180°

0°

330°

3.15 kHz 4 kHz 5 kHz 6.3 kHz

210°

180°

0°

330°

8 kHz 10 kHz 12.5 kHz 16 kHz

210°

180°

90°

270°

120°

240°

150°

30°

60°

120°

150°

30°

60°

120°

150°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

90°

270°

120°

240°

150°

30°

60°

120°

150°

30°

60°

120°

150°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

90°

270°

120°

240°

150°

30°

60°

120°

150°

30°

60°

120°

150°

210°

330°

300°

90°

270°

240°

210°

330°

300°

90°

270°

240°

210°

USER MANUAL

VERSION :1.01

DATE : 06/10/10

90°

120°

150°

180°

0°

30°

60°

90°

120°

150°

180°

0°

30°

60°

90°

120°

150°

180°

α

α

α

P 30

0

700

600

500

400

Alpha M3 – Vertical Directivity ( 5dB / div.)

0°

330°

300°

270°

240°

210°

330°

300°

270°

240°

210°

330°

300°

30°

60°

300°

90°

200 Hz 250 Hz 315 Hz 400 Hz

180°

0°

500 Hz 630 Hz 800 Hz 1 kHz

180°

0°

270°

120°

240°

150°

30°

60°

300°

90°

270°

120°

240°

150°

30°

60°

300°

0°

330°

210°

330°

210°

330°

30°

60°

300°

90°

270°

120°

240°

150°

180°

0°

30°

60°

300°

90°

270°

120°

240°

150°

180°

0°

30°

60°

300°

0°

330°

210°

330°

210°

330°

30°

60°

300°

90°

270°

120°

240°

150°

180°

0°

30°

60°

300°

90°

270°

120°

240°

150°

180°

0°

30°

60°

300°

0°

330°

210°

330°

210°

330°

30°

60°

90°

120°

150°

180°

0°

30°

60°

90°

120°

150°

180°

0°

30°

60°

270°

240°

300

300°

270°

240°

200

300°

270°

100

240°

0

50 100 150 200 250 300 350 400 450 500 55

1.25 kHz 1.6 kHz 2 kHz 2.5 kHz

210°

180°

0°

330°

3.15 kHz 4 kHz 5 kHz 6.3 kHz

210°

180°

0°

330°

8 kHz 10 kHz 12.5 kHz 16 kHz

210°

180°

90°

270°

120°

240°

150°

30°

60°

120°

150°

30°

60°

120°

150°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

90°

270°

120°

240°

150°

30°

60°

120°

150°

30°

60°

120°

150°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

90°

270°

120°

240°

150°

30°

60°

120°

150°

30°

60°

120°

150°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

USER MANUAL

VERSION :1.01

DATE : 06/10/10

90°

120°

150°

30°

60°

90°

120°

150°

30°

60°

90°

120°

150°

α

α

α

5.5. ALPHA M8

On Axis Response Alpha M8 With AlphaTD Controller (dB)

10.000

0.0

Impedance Alpha M8 (Ohm)

50

P 31

-10.00

-20.00

-30.00
20 100 1k 10k 20k

Frequency Response with AlphaTD Controller (dB) Impedance (Ohms)
Black : MF, Grey : HF

Directivity Index (dB) & Q Alpha M8

20.000

15.000

10.000

5.0000

0.0

100 1k 10k 20k

Directivity Index (dB) and Factor Nominal Coverage @–6 dB (Degrees)

Horizontal Off-Axis Response Alpha M8 (dB)

10.000

0.0

-10.00

-20.00

-30.00
100 1k 10k 20k

Horizontal Off-Axis Frequency Response @ 10, 20 & 30° Vertical Off-Axis Frequency Response @ 10, 20 & 30°

Frequency Response Curves : Anechoic Far Field above 200 Hz, Half-space Anechoic below 200 Hz.
Impedance :
Off-Axis Frequency Response
Directivity Curve, Coverage Angle and Polar Diagram

Voltage to Current Ratio, Free Field measurement

: 1/3 octave smoothed frequency response, normalised to On-Axis response.

100

10

1

from computer processing on off-axis response curves.

10

2

20 100 1k 10k 20k

Coverage Angle Alpha M8 (Degree)

200

100

20

100 1k 10k 20k

Vertical Off-Axis Response Alpha M8 (dB)

10.000

0.0

-10.00

-20.00

-30.00
100 1k 10k 20k

USER MANUAL

VERSION :1.01

DATE : 06/10/10

α

α

α

P 32

0

700

600

500

400

Alpha M8 – Horizontal Directivity ( 5dB / div.)

0°

330°

300°

270°

240°

210°

330°

300°

270°

240°

210°

330°

300°

30°

60°

300°

90°

200 Hz 250 Hz 315 Hz 400 Hz

180°

0°

500 Hz 630 Hz 800 Hz 1 kHz

180°

0°

270°

120°

240°

150°

30°

60°

300°

90°

270°

120°

240°

150°

30°

60°

300°

0°

330°

210°

330°

210°

330°

30°

60°

300°

90°

270°

120°

240°

150°

180°

0°

30°

60°

300°

90°

270°

120°

240°

150°

180°

0°

30°

60°

300°

0°

330°

210°

180°

0°

330°

210°

180°

0°

330°

30°

60°

300°

90°

270°

120°

240°

150°

30°

60°

300°

90°

270°

120°

240°

150°

30°

60°

300°

0°

330°

210°

330°

210°

330°

30°

60°

90°

120°

150°

180°

0°

30°

60°

90°

120°

150°

180°

0°

30°

60°

270°

240°

300

300°

270°

240°

200

300°

270°

100

240°

0

50 100 150 200 250 300 350 400 450 500 55

1.25 kHz 1.6 kHz 2 kHz 2.5 kHz

210°

180°

0°

330°

3.15 kHz 4 kHz 5 kHz 6.3 kHz

210°

180°

0°

330°

8 kHz 10 kHz 12.5 kHz 16 kHz

210°

180°

90°

270°

120°

240°

150°

30°

60°

120°

150°

30°

60°

120°

150°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

90°

270°

120°

240°

150°

30°

60°

120°

150°

30°

60°

120°

150°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

90°

270°

120°

240°

150°

30°

60°

120°

150°

30°

60°

120°

150°

210°

330°

300°

90°

270°

240°

210°

330°

300°

90°

270°

240°

210°

150°

180°

0°

30°

150°

180°

0°

30°

150°

180°

USER MANUAL

VERSION :1.01

DATE : 06/10/10

90°

120°

60°

90°

120°

60°

90°

120°

α

α

α

P 33

0

700

600

500

400

Alpha M8 Ver tical Directivity ( 5dB / div.)

0°

330°

300°

270°

240°

210°

330°

300°

270°

240°

210°

330°

300°

270°

30°

60°

300°

90°

200 Hz 250 Hz 315 Hz 400 Hz

180°

0°

500 Hz 630 Hz 800 Hz 1 kHz

180°

0°

1.25 kHz 1.6 kHz 2 kHz 2.5 kHz

270°

120°

240°

150°

30°

60°

300°

90°

270°

120°

240°

150°

30°

60°

300°

90°

270°

0°

330°

210°

330°

210°

330°

30°

60°

120°

150°

180°

0°

30°

60°

120°

150°

180°

0°

30°

60°

330°

300°

90°

270°

240°

210°

330°

300°

90°

270°

240°

210°

330°

300°

90°

270°

0°

30°

60°

300°

90°

270°

120°

240°

150°

180°

0°

30°

60°

300°

90°

270°

120°

240°

150°

180°

0°

30°

60°

300°

90°

270°

0°

330°

210°

330°

210°

330°

30°

60°

90°

120°

150°

180°

0°

30°

60°

90°

120°

150°

180°

0°

30°

60°

90°

240°

210°

300

300°

270°

240°

200

300°

270°

100

240°

0

50 100 150 200 250 300 350 400 450 500 55

180°

0°

330°

3.15 kHz 4 kHz 5 kHz 6.3 kHz

210°

180°

0°

330°

8 kHz 10 kHz 12.5 kHz 16 kHz

210°

180°

120°

240°

150°

30°

60°

120°

150°

30°

60°

120°

150°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

120°

240°

150°

30°

60°

120°

150°

30°

60°

120°

150°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

120°

240°

150°

30°

60°

120°

150°

30°

60°

120°

150°

210°

330°

300°

90°

270°

240°

210°

330°

300°

90°

270°

240°

210°

150°

180°

0°

30°

150°

180°

0°

30°

150°

180°

120°

60°

90°

120°

60°

90°

120°

USER MANUAL

VERSION :1.01

DATE : 06/10/10

α

α

α

5.6. ALPHA EM

P 34

On Axis Response Alpha EM With AlphaETD Controller (dB)

10.000

0.0

-10.00

-20.00

-30.00
30 100 1k 10k 20k

Frequency Response with AlphaETD Controller (dB) Impedance (Ohms)

Directivity Index (dB) & Q Alpha EM

20.000

15.000

10.000

5.0000

0.0

100 1k 10k 20k

Directivity Index (dB) and Factor Nominal Coverage @–6 dB (Degrees)

Horizontal Off-Axis Response Alpha EM (dB)

10.000

0.0

-10.00

-20.00

-30.00

100 1k 10k 20k

Horizontal Off-Axis Frequency Response @ 10, 20 & 30° Vertical Off-Axis Frequency Response @ 10, 20 & 30°

100

10

1

Impedance Alpha EM (Ohm)

50

10

2

20 100 1k 10k 20k

Coverage Angle Alpha EM (Degree)

200

100

20

100 1k 10k 20k

Vertical Off-Axis Response Alpha EM (dB)

10.000

0.0

-10.00

-20.00

-30.00
100 1k 10k 20k

5.7. ALPHA EF

On Axis Response Alpha EF With AlphaETD Controller (dB)

10.000

0.0

-10.00

-20.00

-30.00
30 100 1k 10k 20k

Frequency Response with AlphaETD Controller (dB) Impedance (Ohms)
Black : LF, Grey : MF+HF

Frequency Response Curves :
Impedance :
Off-Axis Frequency Response
Directivity Curve, Coverage Angle and Polar Diagram

Voltage to Current Ratio, Free Field measurement

Anechoic Far Field above 200 Hz, Half-space Anechoic below 200 Hz.

: 1/3 octave smoothed frequency response, normalised to On-Axis response.

from computer processing on off-axis response curves.

USER MANUAL

VERSION :1.01

DATE : 06/10/10

Impedance Alpha EF (Ohm)

50

10

2

20 100 1k 10k 20k

α

α

α

P 35

0

700

600

500

400

Alpha EM – Horizontal Directivity ( 5dB / div.)

0°

330°

300°

270°

240°

210°

330°

300°

270°

240°

210°

330°

300°

30°

60°

300°

90°

200 Hz 250 Hz 315 Hz 400 Hz

180°

0°

500 Hz 630 Hz 800 Hz 1 kHz

180°

0°

270°

120°

240°

150°

30°

60°

300°

90°

270°

120°

240°

150°

30°

60°

300°

0°

330°

210°

330°

210°

330°

30°

60°

120°

150°

180°

0°

30°

60°

120°

150°

180°

0°

30°

60°

330°

300°

90°

270°

240°

210°

180°

330°

300°

90°

270°

240°

210°

180°

330°

300°

0°

30°

60°

300°

90°

270°

120°

240°

150°

0°

30°

60°

300°

90°

270°

120°

240°

150°

0°

30°

60°

300°

0°

330°

210°

330°

210°

330°

30°

60°

90°

120°

150°

180°

0°

30°

60°

90°

120°

150°

180°

0°

30°

60°

270°

240°

300

300°

270°

240°

200

300°

270°

100

240°

0

50 100 150 200 250 300 350 400 450 500 55

1.25 kHz 1.6 kHz 2 kHz 2.5 kHz

210°

180°

0°

330°

3.15 kHz 4 kHz 5 kHz 6.3 kHz

210°

180°

0°

330°

8 kHz 10 kHz 12.5 kHz 16 kHz

210°

180°

90°

270°

120°

240°

150°

30°

60°

120°

150°

30°

60°

120°

150°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

90°

270°

120°

240°

150°

30°

60°

120°

150°

30°

60°

120°

150°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

90°

270°

120°

240°

150°

30°

60°

120°

150°

30°

60°

120°

150°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

0°

330°

300°

90°

270°

240°

210°

180°

USER MANUAL

VERSION :1.01

DATE : 06/10/10

90°

120°

150°

30°

60°

90°

120°

150°

30°

60°

90°

120°

150°

α

α

α

P 36

0

700

600

500

400

Alpha EM – Vertical Directivity ( 5dB / div.)

0°

330°

300°

270°

240°

210°

330°

300°

270°

240°

210°

330°

300°

30°

60°

300°

90°

200 Hz 250 Hz 315 Hz 400 Hz

180°

0°

500 Hz 630 Hz 800 Hz 1 kHz

180°

0°

270°

120°

240°

150°

30°

60°

300°

90°

270°

120°

240°

150°

30°

60°

300°

0°

330°

210°

330°

210°

330°

30°

60°

300°

90°

270°

120°

240°

150°

180°

0°

30°

60°

300°

90°

270°

120°

240°

150°

180°

0°

30°

60°

300°

0°

330°

210°

330°

210°

330°

30°

60°

300°

90°

270°

120°

240°

150°

180°

0°

30°

60°

300°

90°

270°

120°

240°

150°

180°

0°

30°

60°

300°

0°

330°

210°

330°

210°

330°

30°

60°

90°

120°

150°

180°

0°

30°

60°

90°

120°

150°

180°

0°

30°

60°

270°

240°

300

300°

270°

240°

200

300°

270°

100

240°

0

50 100 150 200 250 300 350 400 450 500 55

1.25 kHz 1.6 kHz 2 kHz 2.5 kHz

210°

180°

0°

330°

3.15 kHz 4 kHz 5 kHz 6.3 kHz

210°

180°

0°

330°

8 kHz 10 kHz 12.5 kHz 16 kHz

210°

180°

90°

270°

120°

240°

150°

30°

60°

120°

150°

30°

60°

120°

150°

210°

180°

0°

330°

300°

90°

270°

240°

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180°

0°

330°

300°

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270°

240°

210°

180°

90°

270°

120°

240°

150°

30°

60°

120°

150°

30°

60°

120°

150°

210°

180°

0°

330°

300°

90°

270°

240°

210°

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0°

330°

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90°

270°

240°

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180°

90°

270°

120°

240°

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30°

60°

120°

150°

30°

60°

120°

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210°

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300°

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270°

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330°

300°

90°

270°

240°

210°

150°

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0°

30°

150°

180°

0°

30°

150°

180°

USER MANUAL

VERSION :1.01

DATE : 06/10/10

90°

120°

60°

90°

120°

60°

90°

120°

α

α

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III. DIMENSIONS

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USER MANUAL

VERSION :1.01

DATE : 06/10/10

α

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IV. TRANSPORT

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USER MANUAL

VERSION :1.01

DATE : 06/10/10

α

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USER MANUAL

VERSION :1.01

DATE : 06/10/10

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USER MANUAL

VERSION :1.01

DATE : 06/10/10